function myfunction(){
	var a = document.getElementById('username').value;
	var b = document.getElementById('pwd').value;
	if(a=='duxuqiang'){
		if(b=='123456'){
			window.location.href="index.html";
			return true;
		}else{
			alert("密码或账号输入错误！")
			return false;
		}
	}else{
		alert("密码或账号输入错误！")
			return false;
	}
}